rolling average without time intelligence

[qubit813]

I have a measure ([Total Sales]) that I want to compute a 6-week rolling average on.  The "date" grain of my data model is week.  So, I am unable to use the quick measure feature to auto-generate a rolling average.  My week labeling is unusual (e.g., "FY 1 W1"); this is stored in column [Week Label].  So, I have created a [Week Number] column to get the proper ordering.  My newest [Week Number] is 52; my oldest [Week Number] is 1.  I have tried the following in a visual with axis [Week Label], but it's returning the [Total Sales] for each week, not the 6-week rolling average.  How can I resolve this?

Rolling 6 Weeks Average of Total Sales =

//get the given week
VAR __given_week =
    SELECTEDVALUE('Dimension Week'[Week Number])

//calculate total sales for each week
VAR __table =
    ADDCOLUMNS(
        SUMMARIZE(
            'Dimension Week'
            ,'Dimension Week'[Week Number]
        )
        ,"Total Sales Value"
        ,[Total Sales]
    )

RETURN
    AVERAGEX(
        FILTER(
            __table
            ,[Week Number] <= __given_week
            && [Week Number] > __given_week - 6
        )
        ,[Total Sales]
    )

[v-robertq-msft]

Hi, @qubit813 

Glad to hear that you have solved your problem by yourself and thank you for the experience sharing.😊

Would you like to mark your own reply as a solution so that others can learn from it too?

Thanks in advance!

How to Get Your Question Answered Quickly 

Best Regards,

Community Support Team _Robert Qin

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[qubit813 · Accepted solution]

I solved my problem with the following:

Rolling 6 Weeks Average of Total Sales = 

//get the given week
VAR __given_week =
    SELECTEDVALUE('Dimension Week'[Week Number])

//number of weeks in rolling average
VAR __duration =
    6

//create a table of weekly ranges per week
VAR __calculation_range =
    FILTER(
        ALL('Dimension Week')
        ,[Week Number] <= __given_week
        && [Week Number] > __given_week - __duration
    )

RETURN
    IF(
        COUNTROWS(__calculation_range) = __duration //only return the result when there are the desired number of weeks in the range (e.g., week 5 doesn't have 6 weeks in it)
       ,CALCULATE(
            AVERAGEX(
                    'Dimension Week'
                    ,[Total Sales]
            )
            ,__calculation_range
        )
        ,BLANK()
    )